FOSSIL FLOKA. 51 



PLATE XVII. 



" Ornamented Calamite." 



ites decoratus, Artis. 

 , of Brongniart, Hist. Veg. Foss. tab. 14, figs. 1 — 5.) 



In this species of Calamite the joints are short, and decrease in length towards the summit, 

 where they terminate in an enlarged rounded head. The striae are ornamented with tubercles at 

 the bottom, close to the articulation. The strise are broader, and the tubercles larger, towards 

 the summit. 



The stem is sometimes found two feet long, and from two to four inches in diameter. 



The situation of the tubercles at the lower extremity of the striae, is a striking feature of this 

 species ; and the termination of the summit of the stem is remarkable for its obtuseness. 



The specimen is from Leabrook Quarry, Yorkshire. 



